Code call mechanism



March 8, 1949 K. W. GRAYBILL ET AL CODE CALL MEGHANISM 5 Sheets-Sheet lFiled May 5, 1945 Ufcu m v low NOE INVENTORS KENNETH w. GRAYB|LL HANSsENsEauscr-a BY ATTORNEY March 8, 1949. K. w. GRAYBILL T AL 2,463,688

CODE CALL MECHANISM Filed May 3, 1945 3 Sheets-Sheet 2 4 FIGA C: gINVENTORS.

f H KENNETH w. GRAYBILL HANS sENGEBuscr-l ATTO RN EY March 8, T949. K.GRAYBILL ET AL 2,463,683

CODE CALL MECHANISM Filed May 3, 1945 3 SheetS-She 3 COMMERCIAL CIRCUIT'COMMERCIAL clRoulT INVENTORS.

KENNETH W. GRAYBILL HANS SENGEBUSGH ATTORNEY Patented Mar. 8, 1949UNITED STATES PATENT OFFICE CODE CALL MECHAN ISM Application May 3,1945, Serial No. 591,732

4 Claims.

This invention relates to code call systems for controlling current foroperating a group of bells, horns, whistles or a combination of theseand other signaling devices, on the basis of code signals, each composedof a series of electrical impulses.

The principal object of the invention is the provision of a simple andinexpensive mechanism for transmitting selected code signals, anapparatus which will be compact, dependable in operation and capable ofeasy, quick and flexible manual control.

One of the features relates to a novel mechanism for selecting the code.This mechanism is controlled by the rotation of a knob to locate theindicator opposite the code number to be sent, and also to set an armunderneath the top plate opposite the coded cam member which correspondsto the wanted code number.

Another feature is the means for displaying a colored signal during thetime the code is being transmitted. This signal appears when the leverswitch is moved, either to the right or left to start the motor, anddisappears when the motor stops. Thus the operator has a visualindication when the machine is in operation.

Another feature is the arrangement of a spring set to maintain thecurrent supply connected to the motor for an interval after the code hasbeen repeated twice or more, to assure that the shaft on which the codedcam members are arranged will be rotated back to a so-called homeposition. This feature is effective whether the lever key is manuallyrestored from the locked position or operated to the left to itsnon-lock position. In either case the motor will continue to rotate theshaft until said shaft is returned to its home position.

Other novel features relate to the means for locking the code selectingmechanism while the device is in operation and to the mechanism forselecting the proper code wheel and causing its operation to control acommon member. Other features relating to the novel construction andrelation of the various parts will be apparent from the followingdetailed description and from the drawings.

The drawings consists of 6 figures on 2 sheets.

Figure 1 is a View of the top or face plate, showing the code selectingknob, starting lever switch and space for a list of persons who havebeen assigned a code.

Figure 2 is a View from the left side of Fig. 1 with a portion of thecover removed.

Figure 3 is a view from the right side of Fig.

1 with the cover removed, showing the main shaft and the motor housing.

Figure 4 is a sectional View along the line A-A in Figure 1, showing therelation between the main shaft, the slidable arm and the impulsing barand spring contacts.

Figure 5 is a bottom View of Fig. 1 with the cover removed showing theend of the main shaft, its pinion gear and the gear Wheel with a studfor operating the lock member.

Figure 6 is a schematic diagram showing the arrangement of the leversfor setting the indicator opposite the code number and name, andsimultaneously setting the transmitting arm opposite the code member.

Figure 7 is a typical circuit arrangement applicable to this invention.

In Figs. 4 and 5 the knob 3 and lever switch 1 on the top of the casehave been omitted.

The top or face plate I, of the unit, displays a lined card 2 underneatha glass, on which a list of names may be typed or printed, of thepersons who have been assigned a code number. The card can easily beremoved and replaced by a new card whenever it is necessary to make newassignments or other changes. The portions of the top plate, IIJ for thesubscribers list and portion 8 for the indicator, are cut away and theopenings covered with glass. In the space 9, the code numbers arestenciled directly onto the top plate and this portion is not coveredwith glass. Another opening II, which is covered with glass, is for thedisplay of a red signal 42, to indicate when the set is in operation.

The working parts of this code call mechanism are mounted on aframe-work of thin sheet metal see Figure 2, composed of a base plateI2, a top plate I3 and two end members I4 and I5. A cover member I6 isplaced over the frame work and held in place by 3 screws, such as I1.This member IS covers the complete mechanism but leaves exposed aportion of the face plate I. It will be noted in Figure 2 that the rearmember I4 is higher than the front end member I5, and when the set restson the rubber feet, this results in the face plate being elevated at itstop end, approximately 15 degrees, which gives the operator a clearervision of the names and code numbers. The base plate is equipped with 4rubber feet, such as 4I, to protect the surface on which the machinerests. The external impulsing circuit would be attached to the terminals29 and 30. The motor, not shown, is enclosed in a housing 6, in Figure2.

There are displayed in Figure 1, twoV moveable parts, a knob 3 forsetting the indicator opposite the code which it is desired to transmitand a lever switch l, which is used to start the motor. To select a codethe knob 3 is turned either clockwise or counter clockwise, this isdependent upon the position of the indicator 4. To move the indicator toa higher position in the space 8, the knob 3 would be rotated clockwiseand to move the indicator to a lower position the knob 3 must be rotatedcounter clockwise. The method of selecting a code to be transmitted willbe understood from Figure 6. Rotation of knob 3, on its axis 62, causesthe arc shaped member 46, Which is underneath the top plate I andrigidly xed to the shaft S2, to also rotate in the same direction asknob 3. The arc shaped end of member 46 is provided with V-shapednotches to receive the projection 45 on lever 44, for the lockingfeature. The other end of member 46 is attached to one end of lever 66by a pivot 63, on which lever 66 can rotate. In turn the other end oflever 56 is rotatably attached at the pivotal point `64, near the centerof a second lever 67. One end of lever 6'! is rotatably attached to thetop plate by rivet 65. The other end 59 of lever 5l is slotted andslidably attached to indicator 4. It will be understood that any rotarymovement of the knob 3 will result in moving indicator 4 up or down inthe space 8 and the red signal 5, on indicator 4, can be set oppositeany one of the code numbers, such as 22 or 2,3. Attached to indicator 4is a downward extending arm 3i which is slidably and rotatably mountedon the rod I8. The setting of indicator 4 opposite any code number,simultaneously adjusts arm 3I to its correct position opposite the codecam member, on the main shaft, which is designed to transmit theselected code. The lower end of arm 3l is now between the selected codecam andthe common impulsing bar 24, and one projection 32 of arm 3l isresting against the bar 24 and another projection 33 is in closeproximity to the selected cam.

After the indicator 4 has been set to the code number which it isdesired to transmit, the motor is started by moving the lever switch '5,shown in neutral position in Figure 1. A movement of lever switch 7 tothe left, a non-locking position or to the right to a locking positionwill start the motor 34. A movement of lever switch i to the left willstart the motor and after the selected code has been transmitted twice,the motor will stop automatically. A movement of lever switch 'l to theright will start the motor 3,4 and transmission of the code willcontinue until the lever switch "I is manually restored. It will be seenin Figures 3 and 6 that the hub 75, of lever key l, hasy a slot in theleft side, as viewed in Figure 6, to accommodate a portion of end 43 oflever 44. A portion of lever 44 has been cut away so as to t snuglyagainst one half of shaft 39 of lever key l. It will be seen, in Figure6, that when shaft 39 rotates clockwise, as a result of lever key 1having been moved to the left, the shoulder '54, in the slot of hub 15,will engage the lever 44 and move it to the left. Also, when lever key 7is moved to the right causing a counter clockwise rotation of hub 15,the shoulder 'i3 will engage the lever 44 near its end 43 and, asbefore, the said lever 44 will be moved to the left. In this instancehowever, the pin 38, which is rigidly xed into the hub 75, will passover the upturned end of spring 36 and will come to rest behind theshoulder 3l'. Thus the lever switch 'l is locked in operated positionand will remain until manually restored.

The movement to the left, as viewed in Figure 4 6, of end 43 of lever44, which is caused by the movement of lever switch 'I to the left or tothe right, causes the projection 45, on lever 44, to engage one of theV-shaped notches in member 46, thus locking member 46 from any movementduring the time the machine is in operation. At the same ,time that end43 moves to the left, the other end 4B of lever 44 moves to the right,due to the pivot point 41. A bushing 66 as seen in Fig. 7 is providedand attached to lever 44 and moving therewith to close contact 6l in themotor circuit by causing engagement of springs 69 and 1D. Also, as end48 moves to the right in slot 49, of the end member I5, it also rises,due to its own tension, and comes to rest behind the shoulder 50 andunderneath the L-shaped end 5l of member 52. Member 52 is attached tomember 53 by a rivet 54, on which 52 may rotate, the two members beingkept;l in vproper relation to each other by the spring 55. One end ofmember 53 is attached to the end member l5 by a screw "III, but is freeto rotate thereon. The lower arm 56 of member 53 will be engaged by stud5l, once for each revolution of gear wheel ZI, and end 56 will be forceddownwards and cause rotation of member 53 about its pivot l I. Member 52will also be carried downward and the proper relationship will bemaintained between members 52 and 53 by spring 55. The L-shaped end 5Iof member 52, in being moved downward, will carry with it the end 48 ofvbar 44 and when this end 48 is below the shoulder 50, it is free tomove to the left (in Figure 5) and will so move under pressure ofsprings 59 and '50, provided that lever key l is not in a lockedposition. So long as lever key 'I is in locked position the engagementand movement 0f members 52 and 53 will not be effective to cause themotor to stop and therefore the main shaft I9 will continue its rotationand the selected code will continue to be transmitted. After lever key Ihas been restored to its neutral position, thus freeing end 43 of lever44, then end 43 of lever 44 is also free to move to the left, in theslot 49. Therefore following the return of lever key 'I to neutralposition, the subsequent movement downwards of L-shaped end of member 52will move end 48 below the shoulder 59 and end 48 of bar 44 will,because of the pressure from springs 69 and 10, return to its originalposition at the left in slot 45, thus opening a part of the motorcircuit at contact 5l as seen in Fig. 7. A second stud 58 on the face ofgear wheel 2 l, passes over the curved end of spring l2, once for eachrevolution of gear wheel ZI, causing spring l2 to be pressed downwardsfar enough to open contact 59, which also is apart of the motor circuit.After .contact 6I shown in Fig. 7 in the motor circuit has been opened,the current is maintained through contact 59 until this contact isopened by the action of stud 5 8 which assures that the main shaft I9will always be returned to its, so called, home position.

The motor rotor (not shown) is Connected through a reduction gear (notshown) to the main shaft I9. This shaft i9 is equipped with coded cammembers, one for each code number. The shaft passes through both endmembers I4 and I5 and the lower end is fitted with pinion gear 2U, whichmeshes with gear wheel 2l, mentioned previously, wheel 2| howeverrotates at half the speed as pinion 20,

The selection of the code number as explained above, places arm 3lbetween the code cam member and the common impulsing bar 24 with bushing24' attached thereto. It will be noted in Figure 2, that the impulsingbar 24 parallels the main shaft I9 and is rotatably mounted at thepoints 25 and 26. rIhe bar 24 will follow the im pulses from theselected coded cam, communicated to it through lever 3| and theseimpulses will be relayed by bushing 24 to the impulsing springs 2l and28 as seen in Fig. 7. The function of the impulsing bar 24 will beeffective regardless of which cam member has been selected, due to thefact that the arm 3l is always between any cam, such as 23, and bar 24.When the shaft I9 rotates, counter clockwise in Figure 4 and as seen inFig. 7, the projections (such as 4U) of the selected cam member, pressagainst end 33 of arm 3| forcing this end of the arm to the left (inFigure 4 and in Fig. 7), causing end 32 to move the impulse bar 24, onits axes 2'5 and 26. This action is repeated for each one of theprojections, such as 40, on the coded cam member 23. The cam member 23,as shown in Figure 7, would transmit the code l5, and this code would berepeated twice or more dependent upon the position of the starting leverswitch 1. As soon as the motor stops and knob 3 is free to be rotated tobring the indicator opposite another code number the set is ready forthe transmission of another code signal.

Having described the invention, what is con sidered to be new and isdesired to protect by Letters Patent will be set forth in the followingf.

claims.

What is claimed is:

l. In an impulse sending machine, a shaft carrying a plurality of codedcam members mounted rigidly on said shaft, a bar of equal length to saidshaft and parallel thereto carrying a bushing, a stationary spring setfor controlling a code sending circuit, a rod of equal length to saidshaft and parallel thereto, an arm slidably and rotatably mounted onsaid rod, means for moving said arm along said rod and locking same in aposition opposite any one of said coded cam members, means for rotatingsaid shaft with its said coded cam members for causing said selectedcoded cam member to intermittently actuate said arm in accordance withthe code of the selected cam, said actuation of said arm causing saidbar to actuate said bushing to operate said spring set to transmit animpulse for each actuation of said bar yfor transmitting a code signalthroughout said code sending circuit.

2. In an impulse sending machine, a motor driven shaft carrying aplurality of coded cam members mounted rigidly thereon, a set ofsprings, a bar parallel to said shaft having a bushing for actuatingsaid set of spring contacts for controlling a code sending circuit, arod parallel to said bar having an arm slidably and rotatably mountedthereon, a rst lever for moving said arm to any position along said rod,a rotatable knob fixed to a second shaft, a second lever attached tosaid second shaft and movable in response to the rotation of said knobto cause said second lever to actuate said first lever to cause said armto slide along said rod and come to rest opposite the selected one ofsaid code cam members which has cams corresponding to the said selectedcode number, rotation of said motor driven shaft causing rotation ofsaid coded c-am members and the operation of said arm by the selectedcode cam member, each actuation of said arm operating said bar andbushing to operate said springs to transmit an impulse to therebytransmit a code signal in accordance with the cams on the said selectedcode cam member.

3. in an impulse sending machine, a motor driven shaft equipped with aplurality of coded cam members, a spring set selectively operated by anyof said members to send impulses, a lever switch for operating a levermember, a bushing on said lever member, a spring set operated by saidbushing to close the circuit to the motor of the said motor driven shaftwhen the member is operated, a locking device responsive to the movementof said lever switch for locking said lever, a gear carrying a stud forreleasing said locking device, a pinion gear mounted on the said motordriven shaft meshed with said gear, rotation of said pinion gear by theshaft causing said stud to release said locking device after tworevolutions of said pinion gear.

4. In an impulse sending machine, means for selecting a code, a levermember, a lever switch for operating said lever member, a bushingattached to said lever member for operating a spring set, a coloredsignal attached to said lever member, means for locking said levermember in position to display said signal to indicate a busy condition,a shaft having coded cam members, means for electrically rotating saidshaft for transmitting the selected code, means for releasing said lockand causing said signal display to disappear after the shaft has beenrotated two complete revolutions.

KENNETH WAYNE GRAYBILL.

HANS SENGEBUSCH.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 452,026 Kintner May 12, 18911,023,875 Reynolds Apr. 23, 1912 1,056,269 Fastnacht Mar. 18, 19131,076,896 Lee Oct. 28, 1913 1,144,870 Sohm June 29, 1915 1,249,162 MeadDec. 4, 1917 1,641,616 Blessing Sept. 6, 1927 1,707,909 Gullong Apr. 2,1929 1,965,121 Kardorff July 3, 1934 2,061,273 Green NOV. 17, 19362,183,713 Field Dec. 19, 1939

